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Condensed Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Quarterly Financial Data (unaudited)
Total revenue	$ 21,754	$ 3,503	$ 1,014	$ 1,491	$ 5,664	$ 848	$ 824	$ 2,184	$ 27,762	$ 9,520	$ 10,172
Loss from operations	7,438	(10,312)	(8,986)	(6,478)	(1,350)	(6,287)	(5,053)	(3,767)	(18,338)	(16,457)	(10,520)
Net loss	$ 7,757	$ (10,037)	$ (8,868)	$ (6,444)	$ (1,349)	$ (6,278)	$ (5,044)	$ (3,751)	$ (17,592)	$ (16,422)	$ (60,259)
Basic (in dollars per share)	$ 0.19	$ (0.25)	$ (0.22)	$ (0.19)	$ (0.04)	$ (0.20)	$ (0.16)	$ (0.12)	$ (0.45)	$ (0.52)	$ 34.18
Diluted (in dollars per share)	$ 0.19	$ (0.25)	$ (0.22)	$ (0.19)	$ (0.04)	$ (0.20)	$ (0.16)	$ (0.12)	$ (0.45)	$ (0.52)	$ (3.85)

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.